Auto merge of #73669 - Manishearth:rollup-0n4u7vq, r=Manishearth

Rollup of 11 pull requests

Successful merges:

 - #72780 (Enforce doc alias check)
 - #72876 (Mention that BTreeMap::new() doesn't allocate)
 - #73244 (Check for assignments between non-conflicting generator saved locals)
 - #73488 (code coverage foundation for hash and num_counters)
 - #73523 (Fix -Z unpretty=everybody_loops)
 - #73587 (Move remaining `NodeId` APIs from `Definitions` to `Resolver`)
 - #73601 (Point at the call span when overflow occurs during monomorphization)
 - #73613 (The const propagator cannot trace references.)
 - #73614 (fix `intrinsics::needs_drop` docs)
 - #73630 (Provide context on E0308 involving fn items)
 - #73665 (rustc: Modernize wasm checks for atomics)

Failed merges:

r? @ghost

Author: bors

Cargo.lock

@@ -4200,6 +4200,7 @@ dependencies = [
  "rustc_expand",
  "rustc_feature",
  "rustc_hir",
+ "rustc_index",
  "rustc_metadata",
  "rustc_middle",
  "rustc_session",

src/liballoc/collections/btree/map.rs

@@ -490,6 +490,8 @@ struct MergeIter<K, V, I: Iterator<Item = (K, V)>> {
 impl<K: Ord, V> BTreeMap<K, V> {
     /// Makes a new empty BTreeMap with a reasonable choice for B.
     ///
+    /// Does not allocate anything on its own.
+    ///
     /// # Examples
     ///
     /// Basic usage: